Math, asked by riyabhanushali62, 9 months ago

f. 5(3x – 4y)^2 – 20(2x - y)^2?​

Answers

Answered by MrSudipTO
2

Answer:

-35x²-40xy+40y²

Step-by-step explanation:

Q. 5(3x – 4y)² – 20(2x - y)² ?

5{(3x)²-2.(3x)(4y+(4y)²} - 20{(2x)²-2.(2x)y+ y²}

=5( 9x²-24xy+16y²) -20( 4x²-4xy+y²)

= 45x²-120xy+80y²-80x²+80xy-20y²

= -35x²-40xy+40y²

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